Adam Pash

Zamzar is a web-based file conversion tool that can convert your video, audio, images, and documents from nearly any format to nearly any format you like.

For example, if you've never felt that you could quite figure out how to convert that video you took on your cameraphone to a format you can play on your iPod, Zamzar can do it for you. Zamzar is similar to previously-mentioned online file converter Media-Convert, and both services sort of blow my mind, but I found Zamzar to have a cleaner, easier to use interface, and Zamzar can handle files up to 100MB vs. Media-Convert's 50MB limit. Also, Zamzar lets you convert more than one file at a time, provided you are doing the same type of conversion for each file. — Adam Pash